Machine for coating



June 1930. R. T. JOHNSTON 1, 5

I MACHINE FOR COATING Filed March 20 1923 5 Sheets-Sheet l June 17, 1930. R T, HN T N 1 ,764,080-

MACHINE FOR COATING Filed March 20, 1923 5 Sheets-Sheet 2 June 17, 1930. R. T. JOHNS'II'ON I 1,764,080

MACHINE FOR COATING Filed March 20, 1923 5 Sheets-Sheet 3 June 17, 1930. R 1. JOHNSTON V 1,764,080

MACHINE FOR COATING Filed March 20, 1923 5 Sheets-Sheet 4 Filed March 20 1925 5 Sheds-Sheet z? LS Patented June 1 7, 1930 9 UNIT-En STATES PATENT- OFFICE- ROBERT r. roam, or NEW raunswxcx, NEW JERSEY, assrenon, BY *MESNE AS- srenmnmzs, 'ro THE PATENT AND LICENSING conrom'rron, OF BOSTON, MASSA- cnusmrs, A coarom'rron or MASSACHUSETTS nmcnnm FOB coa'rme Abplicatihrflled March 20, 1923. Serial no. 626,438.

This invention relates to a method and machine for coatin having been designed more particularly 'or coating tad? sheet material with granular'material an if desired, according to a predetermined pattern in one or more colors. While not restricted such as asphalt, the granular surfacing be-' mg applied to one face of the sheet while the coating asphalt is still warm and tacky.

According to the present invention the sheet material is held in elevated position and the surfacing material thrown up against its lower face. By throwing the coating up in this, manner a uniform deposit of the granular material is effected on the exposed area of the sheet which may be defined by a stencil'so as to produce the desired pattern. Suitable properly related stencils for the successive application of granular material-of various colors may be' employed in case more than one color is desired that a pattern in thecolors may be effected.

For a more com lete understandin of this invention, toget er with further ob ects and advantageous details and combinations of parts, reference may be had to the accompanying drawings in which a Figure 1 is a side elevation of a machlne designed to carry out the method of the invent on. I

Figure 2 is a vertipal section on line 2-2 of Figure 1. I

is aperspective of one form of Figure 3 stencil r v v Fi ure 4 is a vertical section on line 4-4 of Figure 2. V

; Figure 5 is a view similar toFigufe 2 but showlng a modification. a

Figure 6 is a vertical section online 6-6 of Fi re 5.

Be erring to these drawings, indicates a pair of spaced side frames on which is supported the operative portions of the mechanism. On the adjacent faces of these frames are journaled opposed series of rollers-3, as shown four such rollers being employed for each side frame for each coating-applying unit,- as shown in the drawings three such units being employed, each arranged to coat with a material of one color. These rollers may have their ends adjacent their respective side'frames 1 flanged so as to retain thereon with capability of rotation about an axis centrally of each series of rollers, a ring 5. Opposite rings 5 are adapted to be connected together by a series of stencil plates 6, one of which is shown detached in Figure 3, the stencil plates and the rings together forming drums withopenings in their peripheries formed by the openings 7 of the stencil plates. These drums form one member of a-pair of feed rolls for the sheet material, the other member being formed by a roll 8 fixed to a'shaft 9 journaled in suitable bearings in opposite side frames immediately above the drum.

The rolls 8 are arranged to be power driven, for this'purpose one end of'each shaft 9 having fixed thereto a beveled gear 10 with which meshes a similar gear 11 on a vertical shaft 12 journaled in brackets 13 extending outwardly from one of the side frames 1. The lower end of the shaft 12 as shown carries a beveled gear 15 with which meshes a bevel pinion 16 on a horizontal drive shaft 17 which may be driven from any suitable source of power (not shown).

The drums are also*desi ned to be driven of the granular material as through one or,

nisms for throwing the granular material against the lower face of the sheet material through the openings in the stencil plates. Various means for eflectingthis may be employed, one means for the purpose being shown in Figures 1,2, and 4 and a different means in Figures 5 and 6. Y I

The means shown in Figures 1, 2, and 4 comprises a trough 25 extending longitudinally within each rotatin drum and supported in stationary posi ion therein, this trough being designed to receivea supply more chutes 26 extendin from a source of supply 27. Dipping within the material in the trough 25 is shown a toothed roller 28 which is fixed to a shaft 29'journ aled in the side frames 1 and designed to' be rotated at any suitable speed as b means of a friction wheel 30 fixed to the s laft 29 with which cooperates a friction pulley 31 adjustable lengthwise of the shaft 12 and keyed to rotate therewith. The ranular material is picked up bythe teeth 0 the roll 28 and is presented to a revolving brush 33, this brush being fixed to a shaft 34 also journaled in the side frames 1 in parallel relation to the shaft 29 and driven by a beveled pinion 35 with which meshes a beveled gear 36 also fixed to the shaft 12. The brush 33 J rotates within a casing 37 which partially encloses the same, and has an upwardly directed chute or spout 38. The material removed by the brush from the toothed roll 28' is cau ht between the bristles 39 of the brush 3.115 the casing 37 until the portion 38 is reached, whereupon the bristles of the brush exert a snapping action on the granular material to project it in a column through the nozzle 38 and against the inner faceof the drum, whereupon the granular material passes through the openings of the drum and impinges on thelower face of the sheet material where some-adheres, due to the tacky condition of the sheet. I

As shown baflle plates 40 may be employed at each-end of each of the drums so that any granular material not finding itsway into contact with the sheet material-may be prevented from reaching the driving gears or other mechanism of the machine and may fall down and be caught in an inclined trough 41 positioned beneath each drum and V positioned a conveyor such as the screw con-- veyor shown at 44 by which the excess gran ular material which finds its way into the conduit may be carried back into its respective source of supply 27- to be used over.

By suitably relating the stencils of the va-- rious drums in angular relation the portions of the sheet to be coatedsby the granular material thrown thereagainst through any of the stencils may be regulated so as to produce the desired surface pattern on the sheet, it being intended that the various drums should be em loyedin connection 7 with surfacing of di erent colors. While only one form of stencil has been indicated in Figure 3, it is evident that any shape and size. of openings may be made therein in accordance with the desired formed on the sheet material. Another form of mechanism for throwing the coating material against the lower face of the sheet comprises, as shown in Figure tion where it will be caught by the'air' emerging from the'nozzle 52 and be carried through the blast pipes and discharged sub.- stantially uniformly throughout the length of the stencil and the drum in a column impinging against the lower face of the stenoil and passing through the openings therein into contact with the sheet material. While as described granular material is preferably employed to be thrown up against the lower face of sheet material while in a tacky condition, it is evident that the same principle might be employed if the sheet were not tacky, but the coating material were of such a nature as to stick there- 'to, such for example as in the nature of a pattern to be not only grains such as crushed slate or sand, but also powdered tab or mica.

As shown the sheet material after passing over all the stencils of the series passes between a pair of pressure rollers 55 which act to compress the coated material into the surface of the sheet so as to insure a proper bond therebetween. It may be noted that as shown the sheet material is led to the first coating mechanism of the series beneath a guideroll 56 positioned above the adjacent upper feed roll 8, that the central up Ier' feed roll 8 'is slightly lower than the rstand third upper rolls 8 and that the nip of the pressure rolls 55 is positioned above the lower edge ofthe last feed roll 8. By this means the rapidly moving sheet may be held under proper tension against these feed rolls so as to prevent whipping. It also permits,

if desired, a sli and the sheet material so that the coating as deposited thereon will not be sharply defined along its edges to effect a slight blending of the colors where they meet whereby any slight offsetting of the stencils relative to each other will not be noticeable.

Havin thus described certain embodiments 0 this invention, it should be evident to those skilled in the art that many changes or modifications might be made therein without departing from its spirit or scope as defined by the appended claims.

I claim:

1. A machine of the class described, com

prising a sheet feeding mechanism comprising a roller and a drum beneath said roller between which the sheet material passes, said drum having peripheral openings, means in said drum for projecting a column of coating material toward the axis of the roll with sutficient velocity to impinge on the inner surface areas of the sheet exposed by the openings of the drum in the line of motion of the projected material and means for reclaiming the coated material not deposited on the sheet. 2. A machine of the class described comprising sheet feeding means including feed rollers above the sheet, drums beneath certain of said feed rollers, said drums having peripheral openings therethrough, and means within each drum for projecting comminuted coating material toward theaxis of the corresponding roller and against the portions of:the sheet registering in passing with said openings in the drum.

3. A machine of the class described com-' prising-spaced side frames,

a series of spaced rolls ournaled on the inner face of said frames, the series on said frames being oppositely disposed, rings rotatably supported.

by said rolls, stencil plates fixed at their ends to said rings and forming therewith a hollow drum, means to feed a sheet comprising a roll extending in parallel relation to and above said drum, means to rotate said feed roll and drum at equal peripheral speeds,

and means for projecting a column of coat ing material against the inner faces of the stencil plates to pass through the openings therein and impin e'on the sheet.

4. A machine 0 the class described comrolls journaled onthe inner face of said frames, the series on said frames being oppositely disposed, rings rotatably supported by said rolls, stencil plates fixed at their ends t5 said rings and forming therewith a hollow drum, means forfeeding a sheet comprising-a roll extending in parallel'relation to and above said. drum, means to rotate said feed roll and drum at equal peripheral speeds, means for projecting a column of 'ht space between the stencils of the drum and on the;

a's erles of spaced.

above and in -inner faces of the stencil plates to pass through the openings therein and impinge on the sheet, a trough to receive coating material not adhering to said sheet, and means for returning material from said trough to said container,

5. A machine of the class described comprising means for supporting and moving a plurality of stencils and a sheet of tacky material in superposed spaced, relation thereto, and means for blowing granular material of different colors against the lower face of the stencils to impinge on the sheet material through'the openings of said stencils. i

6. A machine of the class described comprising a plurality of feed rolls against which the upper face of sheet material may travel, a plurality of stencil plates having openings and movable with the velocity of the sheet adjacent the under face thereof one of which stencil plates is located opposite eachof certain of said rolls, and means for projecting coating material. of diiferent colors against said stencil plates to impinge on the sheet material through the stencil through the openings of said stencil plates into contact with the material.

8. In a machine of the class described, a plurality of spaced stencils having apertures therethrough, means for supporting a sheet lowerface of the above and in close proximity to said stencil but out of contact therewith, and means for separately projecting surfacing material of different colors through said apertures provided by said spaced stencil plates against said sheet.

9. In a machine' of the class described, a

plurality of spaced stencils having aperturesfor supportm a sheet 1 therethrough, means close proximity to said stencil but out of contact therewith, means for advancing'the sheet and the stencil at equal speeds, and means for separately projecting surfacing material of different colors throu h said aplertures against said sheet.

10. n a mac hollow drum having a cylindrical wall, said wall having openings therein to form a ine of the class described, a"

' but out of contact therewit a cylindricalwal stencil, means and nearly tangent tosaid drical stencil and'means extending within thedrum for projecting surfacing material through said openings and against said sheet.

11. In a machine of the class described, a horizontally dis osed hollow drum havnliig apertured to form aste means for rotating said drum with a determined peripheral speed, means for advancing a sheet having one face covered with a tacky substance horizontally over said drum in a direction perpendicular to that of the axis of the drum and at a speed equal to said peripheral speed, the tacky face being toward t e drum, means for guidin said sheet close to the up er portion of sai drum but out of contact t erewith, and. means for projecting a substantially vertical column of comminuted surfacing material upwardly agai'nstL the portions of the sheet registering with the apertures.

In testlmony whereof I-have affixed my signature.

{ROBERT T. JOHNSTON.

for support a sheet above' Tim 

